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loss/increase is considered an attenuation/augmentation of half/double of its original
value; zero dB is the threshold of hearing; 120dB is the threshold of pain.
Decorrelation: Technique used in THX processors for rear speakers to create an
ambient DSP sound field similar in spaciousness and depth as a commercial theater.
Definition: Fidelity of the reproduction of a video picture, affected by resolution.
Deinterlacing: (or re-interleaving) Technique that involves assembling pairs of
interlaced fields into one progressive frame (1/60 of a second long), and showing it
twice, over the same amount of time as two fields. The need for 60 flashes on the
screen each second stems from a biological property called the Flicker Fusion
Frequency, whereby the human brain needs to see a minimum number of single
image flashes in a second to see motion without seeing flicker. See progressive scan
below.
Digital Audio Inputs/Outputs: Audio jacks that can be either coaxial (RCA jack)
or optical (Toslink) and allow for the passage of multi-channel digital audio signals
over a single connection. There are other digital audio connections for multi-channel
audio such as IEEE1394 (FireWire) used in some proprietary links between DVD
players/Receivers/Processors, or the audio portion of HDMI. Digital connections are
prone to less noise and interference than analog audio connections by keeping the
signal in the digital domain.
DLP: DLP stands for Digital Light Processing. DLP projectors and rear projection
televisions provide premium quality images with excellent black levels without the
use of a CRT (Cathode Ray Tube). These projectors use a Digital Micro-mirror
Device (DMD) to create images that are enlarged to fill the screen. The DMD chip
has upwards of 1.3 million tiny mirrors to resolve 720x1280 HD resolution images.
In January 2004, the xHD3 DMD chip was introduced by Texas Instruments (TI, the
manufacturer of DLP DMDs) that claimed having resolution enough to resolve
1080x1920 HD images, although using a 1080x960 DMD chip (half of the mirrors)
and using a technique named wobulation. In 2005, TI announced the release on a
true 1080x1920 DMD chip for front projectors, and new projectors using the
technology introduced at CES 2006. Since DLP is a reflective technology, DLP will
typically have higher ANSI lumens and Contrast Ratios than LCD. A color wheel is
employed to help create a full palette of colors on one-chip projection
implementations, which can produce a “rainbow” viewing effect for some people;
three-chip implementation does not need a color wheel to show all the range of
colors.
DNIe: Samsung’s proprietary name for their video enhancement technology “Digital
Natural Image” enhancement.
Dolby Digital 5.1 Surround: Multi-channel perceptual encoding scheme. Initially,
Dolby’s new surround system was called AC-3 (for audio coder 3). It was introduced
in movie theaters in June 1992 as Dolby Stereo Digital (or Dolby SR). Dolby
Surround is a single-band-limited surround channel with a range of 100 Hz to 7,000
Hz. Dolby Digital, on the other hand, offers a full dynamic range on five discrete
main channels L, C, R, Ls, and Rs (20 Hz - 20,000 Hz), plus a separate .1 channel
for Low Frequency Effects (LFE) intended to be reproduced by a subwoofer. The
surround channels are in stereo (as opposed to mono with Dolby Pro Logic).
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